open source project It lets you test a webpage (via an URL) and detects performance and front-end code quality issues.
This is done by loading the webpage via PhantomJS and collecting various metrics and statistics with the help of Phantomas. These metrics are categorized and transformed into scores. It also gives in-depth details so developpers can correct the detected issues.

bLazy is a lightweight lazy loading and multi-serving image script. It’s written in JavaScript why it doesn’t have any dependencies for 3rd party libraries like jQuery. bLazy is working in all modern browser including IE7+.